Discussed are two theories of professional job satisfaction--(1) unidimensional and (2) multidimensional with special reference to Herzberg's two factor theory. A national sample of over 3,000 engineering graduates responded to a questionnaire and satisfaction index. Analysis of results revealed that job satisfaction is multidimensional. Job satisfaction seemed most related to (1) a general job characteristic factor and (2) professional challenges. Also identified as factors were (1) status, (2) autonomy, (3) professional recognition, (4) interpersonal relations, and (5) supervisory relations. Certain occupational challenges and personal constraints were examined in terms of (1) function, (2) field, (3) degree level, (4) year of B.S. graduation, and (5) industrial classification of employer. Job values and perceptions were shown to be complex. (DH)